Gas-burning furnace.



G. L. FOGLBR.

GAS BURNING FURNACE.

APPLICATION FILED 001111911,

Patented Dec. 3, 1912.

wasza INVENTOR @FFTQE.

GEORGE I1. FOGLER, OF PTTTSBUBGH, PENNSYLVANIA.

GAS-BURNDIG FURNACE.

Specification of Letters Patent.

Patented Dec. 3, 1912.

Application filed October 17, 1911. Serial No. 655,221.

To all whom it may concern:

Be it known that I, GEORGE L. Foams, a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Gas-Burning Furnaces, of which the following is a specification.

This invention relates to gas burners for heating furnaces, such as are used for heating dwellings or boilers for power purposes.

The object of the invention is to provide an improved construction of burner in which the supplies of gas and air are thoroughly intermingled, and brought into such close mutual contact that complete combustion will result and in which the mixture of gas and air is burned in a combustion chamber tightl sealed and having no other air inlet than i rom the burner itself, whereby a more uniform and perfect draft, automatically controlled by the supply of gas, is obtained, and wherein the heated products of combustion yield for heating purposes all or a very large proportion of the heat units resultin from the combustion.

n the accompanying drawing Figure 1 is a vertical cross sectional view of my invention as applied to a hot air heating furnace for household heating purposes; Fig. 2 is a horizontal cross section on the line 22, Fig. 1; Fig. 3 is an enlarged vertical cross sectional View through the burner; Fig. 4 is a horizontal cross sectional view on the line 4-4, Fig. 3 looking in the direction of 35 the arrow; Fig. 5 is a perspective view of the mim'n chamber, and Fig. 6 is a cross sectional vlew through the preliminary mixing chamber on the line 6-6, Fig. 3.

The gas supply pipe is indicated at 1. This ma be connected to a gas main or any other-suitable source of artificial or natural This supply pipe is provided with a suitable regulating cut-E valve 2. The supply pipe communicates with a tapered jet or nozzle 3 projecting into a prelimlnary mim'ng chamber 4. The side of the preliminary mixingchamber 4, around the jet 3, is provided with air inlet openings which'are covered by a suitable regulating,

sleeve 6 having openings 7 therein, this sleeve being preferably so mounted between shoulders 7 a on the chamber as to turn about the preliminary mixing chamber and regulate the admission of an into the same. The gas entering through the inlet 3 draws in with it a certain quantity of air through the openings 5, not suflicient however for perfeet combustion. This gas and air by reason of the action of the jet 3 is well mixed in the chamber 4 and then passes to its opposite end where it streams out into a supply pipe 8 which at its other end is provided with a tapered nozzle 9 projecting into a casing member 10 forming the final mixing chamber. As shown in Figs. 1 and 3, the nozzle 9 is tapered, with its smaller end projecting forwardly, and passes through'the lower end of the mixing chamber and also through a plate 12, preferably brazed or otherwise fastened to the nozzle 9, and which is arranged forwardly of the base of the mixing chamber and is provided with a plurality of small perforations 13 surrounding the nozzle 9. In the base of the mixing chamber 10 and in rear-of the plate 12 are a series of notches or apertures 14 for the free admission of air into the mixing chamher, and it is intended that the size of the apertures 14 and of the orifice 11 shall be such that the mixed gas and air entering through the nozzle 9 will suck or draw in, through the apertures 14, just enough additional air to form the proper mixture for perfect and com lete combustion. The nozzle 9 is provide with a flange 9 to which is brazed or otherwise fastened the lower end of the mixing chamber 10 to support the latter, and, as shown in Fig. 4, is oblong in cross section. In other words, in the form shown, it is longer in one horizontal dimension than in the other dimension, and this is true throughout its longitudinal extent- This arrangement causes the entering fuel suppl or mixture of gas and air to be broug t into close and intimate contact and in passing through the restricted orifice in a thin flat stream, is thoroughly mixed in such amanner as to increase the combustion thereof.

The mixing chamber 10 leads directly, by means of its orifice 11, into a combustion chamber 15 which at its base 16 is hermetically sealed around the mixing chamber 10 in such a, manner that no air or gas may be admitted to the combustion chamber except as it enters through the mim'n chamber 10. The mixing chamber 10 is olilong in'cross section and tapers fromits base 17 to its orifice 11 in somewhat'the same manner as the nozzle 9, as shown in Fig. 4. Forwardly of the mixing chamber 10 and supported by brackets 18 attached to the sides of the comi bustionchamber 15 is a hollow cone 19 which is arranged with its open or concave bustion chamber .15 with burning gas and flame, thus producing-complete combustion of all gas admitted to the chamber.

In the drawings my invention is shown as applied to what is known as a hall heating furnace In this form of the invention, the combustion chamber 15 forms the beginning of a system of flues and chambers through whichthe hot gases and products of combustion pass to the chimney or stack; The fiues and chambers are all contained within an outer hot air collecting casing 20, at the bottom of which, as at 21, is sup, ported an annular hollow ring or casing 22, which is formed of inner and outer cylinders 23, bottom plate 24 and top plate 25. In the 4 hollow ring are a number of vertical radially arranged dividing walls 26 which break )up the ring into a plurality of chambers 15,

27, 28 etc. The combustion chamber 15 into which the mixing chamber leads through an aperture in its bottom, constitutes the first chamber in the lower casing 22. In the upper part of the furnace is a second hollow ring or casing 29, similar in construction to the lower one just described, and supported from the outer collecting casing 20 by angle irons or plates 30. rin like the lower one, is broken up into a num er of chambers 31, 32 byvertical radially arranged dividing walls 33. I Connecting the various chambers of the upper and lower rings are a plurality of vertical flues 34 with openings at each end thereof leading into the chambers. These flues and the dividing walls in the upper and lower rings are so arranged that the hot gases produced in the combustion chamber 15 will pass from the first or com-1 bustionchamber 15 into the first vertical flue and upwardly into the first chamber in the upper ring. This chamber has a communication with the second or adjacent vertical Hire and the hot gases thereforepass into the second chamber. in the lower hollow-ring, They thence pass-from the second chamber into the third vertical fine and upwardly into the upper hollow-ring. In this manher, by providing an uneven number of vertical ues, the gases are caused to pass up and down from chamber to chamber through the dues in a zig-zag course ending finally in the last chamber 32 in the upper ring, from whence they pass outwardly through flue 35 to the ch1mney or stack.

The outer casing 20 has a converging top hot air heating furnace. It

menses 36. which isprovided with an outstanding flange 37 which preferably is attached to the underside of, the. floor of a dwelling by slips or clamps 38. The space around the dues and in the center of the collecting casing 20 is in communication with the atmosphere at.

its bottom through anopening 39 through the center of the lower ring; At its top t e space in the center of the casing 20 communicafes through the opening 40 with a register or other convenient regulating means in the floor, as is usual inhotair furnaces;

In the lower portionv of the collecting chamber'20 an upwardly and inwardly'inclined bafie plate or ring' 41 is provided, extending around the inner circumference'of the chamber 20 and supported above the space 12 around the lower ring b clips or irons 43 riveted or otherwise attac edto the baiiie 11 and ring. This baffle plate deflects such air as enters thecollecti'ng chamber 20 around the exterior of the lower ring toward the center of the chamber and into contact with the several vertical flues 3d. 1 The combustion chamber 15 is provided with a side door '44 and a door 45 is also placed in the outer collecting casing '20 directly opposite the door 44. These doors are intended to give access to the chamber15 for cleaning purposes or for making repairs and lighting the gas. The door 44 is so constructed, however,

that when closed it hermetically closes its aperture and precludes-- the adnussion of air at this point. The walls and jointsof the chamber15 and, in fact, all of the chambers and fiues in thesystem are tightly riveted together so that seal is provided at all points, For this reason the construction is such that the only inlet to the system of dues and chambers is into the chamber 15 through" the orifice 11 of the mim'ng chamber 10,) The only outlet from the system *of fines and chambers is from the last upper chamber 32 through the flue 35 to the. stack.- Since free access of air to the chamber 15 and flues is prohibited it" a hermetical is apparent that there will be-no draft therethrough. The entering gas and air, coming into the chamber 15 from acomparatively small feeding orifice are caused to flow at p I considerably reduced speed when they pass ,through the chamber 15 and subsequentflues v gbecause of the much greater relative size thereof. Consequently, it takes some time for the heated-products of'combustion to travel clear through'the s stem and during all 'this time they stead' y yield up their stored heat units to the surrounding air in collecting casing 20. In fact, with my improved system, it is found that while the hamber-15 and first flue 34 will be red hot the outgoing flue 35 will be very nearly cold.

Asshown, my inventionis applied to a is apparent,

noeaeae however, that it may be equally well applied to heating plants which utilize either hot water or steam as the circulating medium. In such cases the hot water or steam would be arranged to circulate around or through the hollow rings and fiues, and the hot water or steam thus produced would circulate through a proper system of pipes to the.

various oints in the house where radiators are desired. My invention may also be adapted for heating water for forming steam for power purposes by being connected to any ordinary form of power boiler.

The operation of the improved furnace will be obvious from the foregoing description and the accompanying drawings. The gas supply enters through the pipe 1 and is mixed in the preliminary mixing chamber 4 with a certain quantity of air which is drawn in by the action of the jet or nozzle 3 through the openings 5. This preliminary mixture passes out through the oblong tapering nozzle 9 where it is more closely intermingled and sucks in a second supply of air through the apertures 14 and perforations 13 in the plate 12. These small perforations cause the formation of fine jets or streams of air which attack the incoming preliminary mixture and break it up more finely, thus accomplishing a second mixture and a more complete intermingling of thefuel supply. The tapered and oblong arrangement. of the mixing chamber 10 then causes the gas to pass forwardly and leave the mixin chamber 10 in a thin fluid stream which is introduced directly into the combustion chamber and thrown or forced against the perforated cone 19. Here it is partially thrown back and around the cone, some of the mixture passing through the perforations therein and, as a consequence, the combustion chamber, which in reality is the first chamber in the lower ring, the first vertical flue and the first chamber in the upper ring are completely filled with a mass of burning fuel. All the products of combustion pass up and down through the several fines and in this manner give up their stored heat units to the air passing through the center of the casing, and thence pass outwardly through the final due to the stack. The air passing up through the collecting casing 20 and around the system of dues andrings or casings becomes heated to a degree depending upon the amount of fuel supplied to my improved burner and passes out through the opening 44) to the u per room or if so desired, to a due for con ucting the same to a more distant point,

What I claim is 1. ln a gas furnace, the combination of a sealed casing forming a combustion chamber and provided with an outlet for waste gases, a casing forming a mixing chamber and opening into the combustion chamber, a

. &

perforated plate in said mim'ng chamber, said mixing chamber casing being formed to permit free supply of air to the perforations of saidplate, a nozzle projecting beyond the perforated plate and into the mixing chamber, a gas supply connection to said nozzle, and a flange on said nozzle connected to-and supporting said mixing chamber casing.

2. In a gas furnace, the combination of a sealed casing formin a combustion chamber and provided wlth an outlet flue for waste gases, a casing forming a mixing chamber sealed into the base of the combustion chamber and having an oblong mouth openin thereinto, a perforated plate in the base 0 the mixin chamber, said mixing chamber casing being formed with lateral openings to permit free supply of air to the perforations of said plate, a nozzle having an oblong mouth projecting beyond the perforated plate and into the mixing chamber, K

and a gas supply connection to said nozzle, said connection being providedwith lateral openings for admitting a supply of air thereinto.

3. In a gas furnace, the combination of a sealed casing forming a combustion chamber and having an outlet flue, a perforated chamber having air inlets to its base, a perforated transverse plate supported in. the mixing chamber in advance of said air inlets, a tapered nozzle projecting through said plate and opening into the mixing chamber, a fuel supply connection to said nozzle including a preliminary mixin chamber, and means for supplying air and fuel to said preliminary mixing chamber.

-5. ltn a gas furnace, the combination of a casing forming a combustion chamber and having a flue, a perforated bafie plate "therein, a tapered casing forming a mixlng chamber sealed in and projecting into the combustion chamber, the mouth of the mix ing chamber being alined with said batfle 7 plate, a perforated plate in the base of the mixing chamber, a tapered nozzle oblong in cross section projecting through the perforated plate and into the mixing chamber, and a gas supply connection to said nozzle.

6. In a gas furnace, the combination of. easing forming a combustion chamber and having a. flue a, beflie pl'm u porta in said ing chamber leading. into the combustion my hand.

'5 chamber, -.a, 'pepforatefi'plate in the base oi the mixing chamber, a,- tapered nozzle oblon in-cro's section projecting through the per orated plate and into the mixing chamher, the open end of said cone facing said 19 npzzle, -a preljminarymixing chamber hav-' ing means for'sup air thereto,

and a connection tween said prelimmary mixing chamber and said-nozzle;

In testimony whereof I have hereunto set n F. W. WINTER,

. MARY E. CAHoon'.

in .EOGLER- 

